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transmission/libtransmission/makemeta.c

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/*
* This file Copyright (C) 2010-2014 Mnemosyne LLC
*
* It may be used under the GNU GPL versions 2 or 3
* or any future license endorsed by Mnemosyne LLC.
*
*/
#include <errno.h>
#include <stdlib.h> /* qsort */
#include <string.h> /* strcmp, strlen */
#include <event2/util.h> /* evutil_ascii_strcasecmp() */
#include "transmission.h"
#include "crypto-utils.h" /* tr_sha1 */
#include "error.h"
#include "file.h"
#include "log.h"
#include "session.h"
#include "makemeta.h"
#include "platform.h" /* threads, locks */
#include "tr-assert.h"
#include "utils.h" /* buildpath */
#include "variant.h"
#include "version.h"
/****
*****
****/
struct FileList
{
uint64_t size;
char* filename;
struct FileList* next;
};
static struct FileList* getFiles(char const* dir, char const* base, struct FileList* list)
{
if (dir == NULL || base == NULL)
{
return NULL;
}
char* buf = tr_buildPath(dir, base, NULL);
tr_sys_path_native_separators(buf);
tr_sys_path_info info;
tr_error* error = NULL;
if (!tr_sys_path_get_info(buf, 0, &info, &error))
{
tr_logAddError(_("Torrent Creator is skipping file \"%s\": %s"), buf, error->message);
tr_free(buf);
tr_error_free(error);
return list;
}
tr_sys_dir_t odir = info.type == TR_SYS_PATH_IS_DIRECTORY ? tr_sys_dir_open(buf, NULL) : TR_BAD_SYS_DIR;
if (odir != TR_BAD_SYS_DIR)
{
char const* name;
while ((name = tr_sys_dir_read_name(odir, NULL)) != NULL)
{
if (name[0] != '.') /* skip dotfiles */
{
list = getFiles(buf, name, list);
}
}
tr_sys_dir_close(odir, NULL);
}
else if (info.type == TR_SYS_PATH_IS_FILE && info.size > 0)
{
struct FileList* node = tr_new(struct FileList, 1);
node->size = info.size;
node->filename = tr_strdup(buf);
node->next = list;
list = node;
}
tr_free(buf);
return list;
}
static uint32_t bestPieceSize(uint64_t totalSize)
{
uint32_t const KiB = 1024;
uint32_t const MiB = 1048576;
uint32_t const GiB = 1073741824;
if (totalSize >= 2 * GiB)
{
return 2 * MiB;
}
if (totalSize >= 1 * GiB)
{
return 1 * MiB;
}
if (totalSize >= 512 * MiB)
{
return 512 * KiB;
}
if (totalSize >= 350 * MiB)
{
return 256 * KiB;
}
if (totalSize >= 150 * MiB)
{
return 128 * KiB;
}
if (totalSize >= 50 * MiB)
{
return 64 * KiB;
}
return 32 * KiB; /* less than 50 meg */
}
static int builderFileCompare(void const* va, void const* vb)
{
tr_metainfo_builder_file const* a = va;
tr_metainfo_builder_file const* b = vb;
return evutil_ascii_strcasecmp(a->filename, b->filename);
}
tr_metainfo_builder* tr_metaInfoBuilderCreate(char const* topFileArg)
{
char* const real_top = tr_sys_path_resolve(topFileArg, NULL);
if (real_top == NULL)
{
/* TODO: Better error reporting */
return NULL;
}
struct FileList* files;
tr_metainfo_builder* ret = tr_new0(tr_metainfo_builder, 1);
ret->top = real_top;
{
tr_sys_path_info info;
ret->isFolder = tr_sys_path_get_info(ret->top, 0, &info, NULL) && info.type == TR_SYS_PATH_IS_DIRECTORY;
}
/* build a list of files containing top file and,
if it's a directory, all of its children */
{
char* dir = tr_sys_path_dirname(ret->top, NULL);
char* base = tr_sys_path_basename(ret->top, NULL);
files = getFiles(dir, base, NULL);
tr_free(base);
tr_free(dir);
}
for (struct FileList* walk = files; walk != NULL; walk = walk->next)
{
++ret->fileCount;
}
ret->files = tr_new0(tr_metainfo_builder_file, ret->fileCount);
for (int i = 0; files != NULL; ++i)
{
struct FileList* tmp = files;
files = files->next;
tr_metainfo_builder_file* file = &ret->files[i];
file->filename = tmp->filename;
file->size = tmp->size;
ret->totalSize += tmp->size;
tr_free(tmp);
}
qsort(ret->files, ret->fileCount, sizeof(tr_metainfo_builder_file), builderFileCompare);
tr_metaInfoBuilderSetPieceSize(ret, bestPieceSize(ret->totalSize));
return ret;
}
static bool isValidPieceSize(uint32_t n)
{
bool const isPowerOfTwo = n != 0 && (n & (n - 1)) == 0;
return isPowerOfTwo;
}
bool tr_metaInfoBuilderSetPieceSize(tr_metainfo_builder* b, uint32_t bytes)
{
if (!isValidPieceSize(bytes))
{
char wanted[32];
char gotten[32];
tr_formatter_mem_B(wanted, bytes, sizeof(wanted));
tr_formatter_mem_B(gotten, b->pieceSize, sizeof(gotten));
tr_logAddError(_("Failed to set piece size to %s, leaving it at %s"), wanted, gotten);
return false;
}
b->pieceSize = bytes;
b->pieceCount = (int)(b->totalSize / b->pieceSize);
if (b->totalSize % b->pieceSize != 0)
{
++b->pieceCount;
}
return true;
}
void tr_metaInfoBuilderFree(tr_metainfo_builder* builder)
{
if (builder != NULL)
{
for (uint32_t i = 0; i < builder->fileCount; ++i)
{
tr_free(builder->files[i].filename);
}
tr_free(builder->files);
tr_free(builder->top);
tr_free(builder->comment);
for (int i = 0; i < builder->trackerCount; ++i)
{
tr_free(builder->trackers[i].announce);
}
tr_free(builder->trackers);
tr_free(builder->outputFile);
tr_free(builder);
}
}
/****
*****
****/
static uint8_t* getHashInfo(tr_metainfo_builder* b)
{
uint32_t fileIndex = 0;
uint8_t* ret = tr_new0(uint8_t, SHA_DIGEST_LENGTH * b->pieceCount);
uint8_t* walk = ret;
uint8_t* buf;
uint64_t totalRemain;
uint64_t off = 0;
tr_sys_file_t fd;
tr_error* error = NULL;
if (b->totalSize == 0)
{
return ret;
}
buf = tr_valloc(b->pieceSize);
b->pieceIndex = 0;
totalRemain = b->totalSize;
fd = tr_sys_file_open(b->files[fileIndex].filename, TR_SYS_FILE_READ | TR_SYS_FILE_SEQUENTIAL, 0, &error);
if (fd == TR_BAD_SYS_FILE)
{
b->my_errno = error->code;
tr_strlcpy(b->errfile, b->files[fileIndex].filename, sizeof(b->errfile));
b->result = TR_MAKEMETA_IO_READ;
tr_free(buf);
tr_free(ret);
tr_error_free(error);
return NULL;
}
while (totalRemain != 0)
{
TR_ASSERT(b->pieceIndex < b->pieceCount);
uint8_t* bufptr = buf;
uint32_t const thisPieceSize = (uint32_t)MIN(b->pieceSize, totalRemain);
uint64_t leftInPiece = thisPieceSize;
while (leftInPiece != 0)
{
uint64_t const n_this_pass = MIN(b->files[fileIndex].size - off, leftInPiece);
uint64_t n_read = 0;
tr_sys_file_read(fd, bufptr, n_this_pass, &n_read, NULL);
bufptr += n_read;
off += n_read;
leftInPiece -= n_read;
if (off == b->files[fileIndex].size)
{
off = 0;
tr_sys_file_close(fd, NULL);
fd = TR_BAD_SYS_FILE;
if (++fileIndex < b->fileCount)
{
fd = tr_sys_file_open(b->files[fileIndex].filename, TR_SYS_FILE_READ | TR_SYS_FILE_SEQUENTIAL, 0, &error);
if (fd == TR_BAD_SYS_FILE)
{
b->my_errno = error->code;
tr_strlcpy(b->errfile, b->files[fileIndex].filename, sizeof(b->errfile));
b->result = TR_MAKEMETA_IO_READ;
tr_free(buf);
tr_free(ret);
tr_error_free(error);
return NULL;
}
}
}
}
TR_ASSERT(bufptr - buf == (int)thisPieceSize);
TR_ASSERT(leftInPiece == 0);
tr_sha1(walk, buf, (int)thisPieceSize, NULL);
walk += SHA_DIGEST_LENGTH;
if (b->abortFlag)
{
b->result = TR_MAKEMETA_CANCELLED;
break;
}
totalRemain -= thisPieceSize;
++b->pieceIndex;
}
TR_ASSERT(b->abortFlag || walk - ret == (int)(SHA_DIGEST_LENGTH * b->pieceCount));
TR_ASSERT(b->abortFlag || !totalRemain);
if (fd != TR_BAD_SYS_FILE)
{
tr_sys_file_close(fd, NULL);
}
tr_free(buf);
return ret;
}
static void getFileInfo(char const* topFile, tr_metainfo_builder_file const* file, tr_variant* uninitialized_length,
tr_variant* uninitialized_path)
{
size_t offset;
/* get the file size */
tr_variantInitInt(uninitialized_length, file->size);
/* how much of file->filename to walk past */
offset = strlen(topFile);
if (offset > 0 && topFile[offset - 1] != TR_PATH_DELIMITER)
{
++offset; /* +1 for the path delimiter */
}
/* build the path list */
tr_variantInitList(uninitialized_path, 0);
if (strlen(file->filename) > offset)
{
char* filename = tr_strdup(file->filename + offset);
char* walk = filename;
char const* token;
while ((token = tr_strsep(&walk, TR_PATH_DELIMITER_STR)) != NULL)
{
if (!tr_str_is_empty(token))
{
tr_variantListAddStr(uninitialized_path, token);
}
}
tr_free(filename);
}
}
static void makeInfoDict(tr_variant* dict, tr_metainfo_builder* builder)
{
char* base;
uint8_t* pch;
tr_variantDictReserve(dict, 5);
if (builder->isFolder) /* root node is a directory */
{
tr_variant* list = tr_variantDictAddList(dict, TR_KEY_files, builder->fileCount);
for (uint32_t i = 0; i < builder->fileCount; ++i)
{
tr_variant* d = tr_variantListAddDict(list, 2);
tr_variant* length = tr_variantDictAdd(d, TR_KEY_length);
tr_variant* pathVal = tr_variantDictAdd(d, TR_KEY_path);
getFileInfo(builder->top, &builder->files[i], length, pathVal);
}
}
else
{
tr_variantDictAddInt(dict, TR_KEY_length, builder->files[0].size);
}
base = tr_sys_path_basename(builder->top, NULL);
if (base != NULL)
{
tr_variantDictAddStr(dict, TR_KEY_name, base);
tr_free(base);
}
tr_variantDictAddInt(dict, TR_KEY_piece_length, builder->pieceSize);
if ((pch = getHashInfo(builder)) != NULL)
{
tr_variantDictAddRaw(dict, TR_KEY_pieces, pch, SHA_DIGEST_LENGTH * builder->pieceCount);
tr_free(pch);
}
tr_variantDictAddInt(dict, TR_KEY_private, builder->isPrivate ? 1 : 0);
}
static void tr_realMakeMetaInfo(tr_metainfo_builder* builder)
{
tr_variant top;
/* allow an empty set, but if URLs *are* listed, verify them. #814, #971 */
for (int i = 0; i < builder->trackerCount && builder->result == TR_MAKEMETA_OK; ++i)
{
if (!tr_urlIsValidTracker(builder->trackers[i].announce))
{
tr_strlcpy(builder->errfile, builder->trackers[i].announce, sizeof(builder->errfile));
builder->result = TR_MAKEMETA_URL;
}
}
tr_variantInitDict(&top, 6);
if (builder->fileCount == 0 || builder->totalSize == 0 || builder->pieceSize == 0 || builder->pieceCount == 0)
{
builder->errfile[0] = '\0';
builder->my_errno = ENOENT;
builder->result = TR_MAKEMETA_IO_READ;
builder->isDone = true;
}
if (builder->result == TR_MAKEMETA_OK && builder->trackerCount != 0)
{
int prevTier = -1;
tr_variant* tier = NULL;
if (builder->trackerCount > 1)
{
tr_variant* annList = tr_variantDictAddList(&top, TR_KEY_announce_list, 0);
for (int i = 0; i < builder->trackerCount; ++i)
{
if (prevTier != builder->trackers[i].tier)
{
prevTier = builder->trackers[i].tier;
tier = tr_variantListAddList(annList, 0);
}
tr_variantListAddStr(tier, builder->trackers[i].announce);
}
}
tr_variantDictAddStr(&top, TR_KEY_announce, builder->trackers[0].announce);
}
if (builder->result == TR_MAKEMETA_OK && !builder->abortFlag)
{
if (!tr_str_is_empty(builder->comment))
{
tr_variantDictAddStr(&top, TR_KEY_comment, builder->comment);
}
tr_variantDictAddStr(&top, TR_KEY_created_by, TR_NAME "/" LONG_VERSION_STRING);
tr_variantDictAddInt(&top, TR_KEY_creation_date, time(NULL));
tr_variantDictAddStr(&top, TR_KEY_encoding, "UTF-8");
makeInfoDict(tr_variantDictAddDict(&top, TR_KEY_info, 666), builder);
}
/* save the file */
if (builder->result == TR_MAKEMETA_OK && !builder->abortFlag)
{
if (tr_variantToFile(&top, TR_VARIANT_FMT_BENC, builder->outputFile) != 0)
{
builder->my_errno = errno;
tr_strlcpy(builder->errfile, builder->outputFile, sizeof(builder->errfile));
builder->result = TR_MAKEMETA_IO_WRITE;
}
}
/* cleanup */
tr_variantFree(&top);
if (builder->abortFlag)
{
builder->result = TR_MAKEMETA_CANCELLED;
}
builder->isDone = true;
}
/***
****
**** A threaded builder queue
****
***/
static tr_metainfo_builder* queue = NULL;
static tr_thread* workerThread = NULL;
static tr_lock* getQueueLock(void)
{
static tr_lock* lock = NULL;
if (lock == NULL)
{
lock = tr_lockNew();
}
return lock;
}
static void makeMetaWorkerFunc(void* unused UNUSED)
{
for (;;)
{
tr_metainfo_builder* builder = NULL;
/* find the next builder to process */
tr_lock* lock = getQueueLock();
tr_lockLock(lock);
if (queue != NULL)
{
builder = queue;
queue = queue->nextBuilder;
}
tr_lockUnlock(lock);
/* if no builders, this worker thread is done */
if (builder == NULL)
{
break;
}
tr_realMakeMetaInfo(builder);
}
workerThread = NULL;
}
void tr_makeMetaInfo(tr_metainfo_builder* builder, char const* outputFile, tr_tracker_info const* trackers, int trackerCount,
char const* comment, bool isPrivate)
{
tr_lock* lock;
/* free any variables from a previous run */
for (int i = 0; i < builder->trackerCount; ++i)
{
tr_free(builder->trackers[i].announce);
}
tr_free(builder->trackers);
tr_free(builder->comment);
tr_free(builder->outputFile);
/* initialize the builder variables */
builder->abortFlag = false;
builder->result = 0;
builder->isDone = false;
builder->pieceIndex = 0;
builder->trackerCount = trackerCount;
builder->trackers = tr_new0(tr_tracker_info, builder->trackerCount);
for (int i = 0; i < builder->trackerCount; ++i)
{
builder->trackers[i].tier = trackers[i].tier;
builder->trackers[i].announce = tr_strdup(trackers[i].announce);
}
builder->comment = tr_strdup(comment);
builder->isPrivate = isPrivate;
if (!tr_str_is_empty(outputFile))
{
builder->outputFile = tr_strdup(outputFile);
}
else
{
builder->outputFile = tr_strdup_printf("%s.torrent", builder->top);
}
/* enqueue the builder */
lock = getQueueLock();
tr_lockLock(lock);
builder->nextBuilder = queue;
queue = builder;
if (workerThread == NULL)
{
workerThread = tr_threadNew(makeMetaWorkerFunc, NULL);
}
tr_lockUnlock(lock);
}
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